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ORA-12537: TNS:connection closed

I am trying to connect remotely to another linux server. When my servers are started as user 'A' and I connect through sqlplus as system/password@hos from the user 'oracle' i get this error message from the logs:

TNS:Connection closed

Thanks guys, I think I found out the problem. I still have to test it but it appears that when I do a nslookup it isn't configured correctly. It still has the old domain name. Once I change this hopefully it will fix the issue. Thanks again for your help.